plympton



, M. A.PLYMPTON. v MEASURING THE STRENGTH OF WATGH SPRINGS. No. 62,775. V v Patented Mar. 12, 1867.

'-'.r'0:' ALL WHOM IT. MAY CONCERN:

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N. A.'- PLYMPTON, 0E NQRTHBOROUGHQ MASSACHUSETTS.

Letters Patent No. 62;775, dated MafcklZ; 1867; aiite'dated February'25, 1867. I

IMPROVEMENT IN MEASURING THE STRENGTH orwsroa' srnmos. I

, My: seem; numb this this: fistieri'fiateu! amt making as the same.

' Be it know that LN. A. RhYMIfTOlI, o f'Northborough, Worcester county, Store 0'! Massachusetts; have invented a new and improved Gouge for Measuring the Strength of Main-Springs; and I do hereby declare that the following is a full, clear, and exact descriptiorl thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of thisspeciiicetion, -in.which-- a Figure 1 represents an elevation'oi' the inside mechanism of my gauge; 1 Figure 2 is a face \iiew of the same.

*lliigur isaside elevationiofi fillet-suites Similar letters v of referen'ce indicate-like parts;

' I This invention relates to a gauge hywh'ich aflwatch maker is enabled to compolre the strength of different springs in such a. manner that if thesp'rih glbi a watch breaks it is. easy to find another of equal power to take itsi place.

' My gauge consists of a chamber A, which may .be square; or-of any pthenform' or shape; to which access :ishad through a slot, a, in its edge, which is Inge enough to admit theend of the sprihg to'be" tried. In the interior of the chamber is a lever, b, whichjhhs' its fulcrum on a pivot, c, and the loose eiid of which is'bent up and projectsthrough'a segmentalslotfin the face of -the chamber, forming an index whichtraverses over' the scale d; A spring, e, hasa tehdeneyLto keep this iiidegz opposite the starting points of the scale. The spring to I 'be'tried is passed through the slot-ainto the chamber A as far as it will go; then by bringing it-heck to thepin the full strength is thrown on the layer b, foreingthe index ,arouud on the scale; to the-number represhitting its power.

st sntia llyfes and for the purpose described.

What I claim as new, and desire to secure by Letters Patent, is- I Theindex lev,e r b, in combination with the chamber A, slot a, and pin f, constructed and operating suh-' N. A. P MPTON.

Witnesses: v

HENRY E. .Hnwnm, ANDREW B. Ennr. 

